[Dwarf-Discuss] Possible ambiguity with DW_CFA_remember_state/store_state

Paul Pluzhnikov ppluzhnikov at google.com
Sat Jun 13 09:39:07 PDT 2009


>On Fri, Jun 12, 2009 at 07:46:34PM -0400, John DelSignore wrote: FWIW,
>> TotalView saves the CFA along with the explicitly-numbered registers. So,
>> it seems that TotalView and GDB agree, and that GCC is the outlier. IMHO,
>> it's two against one, so GCC should be fixed.

> If TotalView saves CFA along with explicitly-numbered registers on
> DW_CFA_remember_state and restores CFA state in DW_CFA_restore_state, then
> it matches what GCC expects and what GCC unwinder does, it is GDB that
> wasn't saving/restoring CFA state (and GCC unwinder before 2006-10-26,
> but GCC really started emitting these two unwind ops last month).

That's my understanding of John's message as well.

John, could you run the test case from
 http://sourceware.org/bugzilla/show_bug.cgi?id=10275
under TotalView, and confirm that TV produces correct stack trace for it?

Thanks,
-- 
Paul Pluzhnikov



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